WO2011081688A1 - Compensation of motion in a moving organ using an internal position reference sensor - Google Patents
Compensation of motion in a moving organ using an internal position reference sensor Download PDFInfo
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- WO2011081688A1 WO2011081688A1 PCT/US2010/050224 US2010050224W WO2011081688A1 WO 2011081688 A1 WO2011081688 A1 WO 2011081688A1 US 2010050224 W US2010050224 W US 2010050224W WO 2011081688 A1 WO2011081688 A1 WO 2011081688A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/3405—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B34/00—Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
- A61B34/20—Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/12—Devices for detecting or locating foreign bodies
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/52—Devices using data or image processing specially adapted for radiation diagnosis
- A61B6/5258—Devices using data or image processing specially adapted for radiation diagnosis involving detection or reduction of artifacts or noise
- A61B6/5264—Devices using data or image processing specially adapted for radiation diagnosis involving detection or reduction of artifacts or noise due to motion
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/52—Devices using data or image processing specially adapted for radiation diagnosis
- A61B6/5258—Devices using data or image processing specially adapted for radiation diagnosis involving detection or reduction of artifacts or noise
- A61B6/5264—Devices using data or image processing specially adapted for radiation diagnosis involving detection or reduction of artifacts or noise due to motion
- A61B6/527—Devices using data or image processing specially adapted for radiation diagnosis involving detection or reduction of artifacts or noise due to motion using data from a motion artifact sensor
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/30—Determination of transform parameters for the alignment of images, i.e. image registration
- G06T7/33—Determination of transform parameters for the alignment of images, i.e. image registration using feature-based methods
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00681—Aspects not otherwise provided for
- A61B2017/00694—Aspects not otherwise provided for with means correcting for movement of or for synchronisation with the body
- A61B2017/00703—Aspects not otherwise provided for with means correcting for movement of or for synchronisation with the body correcting for movement of heart, e.g. ECG-triggered
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B34/00—Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
- A61B34/20—Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
- A61B2034/2046—Tracking techniques
- A61B2034/2051—Electromagnetic tracking systems
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
- A61B90/36—Image-producing devices or illumination devices not otherwise provided for
- A61B90/37—Surgical systems with images on a monitor during operation
- A61B2090/376—Surgical systems with images on a monitor during operation using X-rays, e.g. fluoroscopy
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61B90/39—Markers, e.g. radio-opaque or breast lesions markers
- A61B2090/3983—Reference marker arrangements for use with image guided surgery
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- A—HUMAN NECESSITIES
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- A61B6/50—Clinical applications
- A61B6/503—Clinical applications involving diagnosis of heart
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- A—HUMAN NECESSITIES
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- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/52—Devices using data or image processing specially adapted for radiation diagnosis
- A61B6/5211—Devices using data or image processing specially adapted for radiation diagnosis involving processing of medical diagnostic data
- A61B6/5229—Devices using data or image processing specially adapted for radiation diagnosis involving processing of medical diagnostic data combining image data of a patient, e.g. combining a functional image with an anatomical image
- A61B6/5235—Devices using data or image processing specially adapted for radiation diagnosis involving processing of medical diagnostic data combining image data of a patient, e.g. combining a functional image with an anatomical image combining images from the same or different ionising radiation imaging techniques, e.g. PET and CT
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10116—X-ray image
- G06T2207/10121—Fluoroscopy
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- G—PHYSICS
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- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30004—Biomedical image processing
- G06T2207/30021—Catheter; Guide wire
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- G06T2207/30004—Biomedical image processing
- G06T2207/30048—Heart; Cardiac
Definitions
- the instant invention relates generally to medical imaging and navigation and more particularly to a system and method for compensation of motion in a moving organ using an internal reference sensor.
- the system includes a medical positioning system (MPS) for ascertaining the location and orientation of multiple MPS sensors, a two-dimensional imaging system having an image detector for obtaining two-dimensional images of the moving organ and a superimposing processor.
- MPS medical positioning system
- the MPS system includes a sensor mounted on the surgical tool and a sensor attached to the body of the patient for a positional reference ("Patient
- the system acquires a plurality of two-dimensional images (and respective location/orientation data and organ timing data, e.g., ECG signal) and records the sets of positions and orientation of all sensors.
- the system reconstructs a three- dimensional image from the combination of 2-D images and sensor data.
- the system detects the location and orientation of the MPS sensor that is mounted on the tool.
- the superimposing processor super-imposes a representation of the surgical tool on the currently displayed two-dimensional and three-dimensional images, which may be played back in accordance with real-time ECG data.
- the PRS is provided so that the sensors associated with the surgical tools remain in a co-registered coordinate system to the X-ray imager at all times.
- the system detects movements of the patient using the PRS (e.g., patient body movements and respiration induced movements).
- the movements are used to shift the coordinate system relative to the coordinate system in which the two-dimensional images were acquired. Therefore, in Strommer et al., the projection of real-time location information on previously recorded 2-D or 3-D images is both ECG synchronized and respiration compensated.
- the external motion compensation signals i.e., the ECG signal and the PRS readings
- the ECG signal may not effectively serve as a predictor or correlation input for the motion of the atria.
- One advantage of the methods and apparatus described, depicted and claimed herein relates to the ability to accurately compensate for the motion of a moving region of interest in a patient's body (e.g., a moving organ such as the heart), such as may be needed when superimposing a representation of a catheter tip on an image acquired at a time different than a time when the position of the catheter tip was acquired.
- a moving region of interest in a patient's body e.g., a moving organ such as the heart
- This disclosure is directed to a method and apparatus for displaying a moving region of interest (ROI) located within a body.
- One embodiment of the method involves tracking the motion of the ROI over time and generating a motion compensation function.
- determining a position and orientation (P&O) of an invasive medical device such as, for example, a catheter.
- the next step involves correcting the determined P&O using the motion compensation function to thereby compensate for the motion of the ROI between a first time at which an image of the ROI was acquired and a second time (different than the first time) at which the P&O was determined.
- the next step involves superimposing a representation of the medical device onto the image in accordance with the corrected P&O.
- tracking the motion of the region of interest involves associating a first localization sensor with the moving region of interest such that the sensor moves with the region of interest.
- the localization system e.g., a medical position system (MPS) in one embodiment
- MPS medical position system
- the method further involves acquiring a second series of P&O readings from a second localization sensor associated with the medical device.
- the correlation between the first and second series of P&O readings exceeds a threshold, the system is enabled to perform motion compensation since the same motion of the region of interest can be assumed to influence the motion of the medical device.
- the motion compensation function may comprise a time- varying vector displacement.
- the function defines a vector displacement (and potentially rotation) by which the P&O of the medical device will need to be corrected so as to match its corresponding value at a time when the image was taken.
- a plurality of localization sensors are deployed, where the compensation function is a weighted summation of the individual displacement vectors respectively attributed to the movements detected by the plurality of localization sensors.
- a weighting factor associated with each input may correspond to the correlation level observed for that input relative to the motion of the medical device.
- Figure 1 is a schematic and block diagram view of a system incorporating an embodiment for compensation of motion in a moving organ using an internal position reference sensor.
- Figure 2 is a diagrammatic view of the system of Figure 1, in a fluoroscopy-based imaging embodiment.
- Figures 3A-3C are plan views showing the motion of a moving organ and the corresponding motion of an internal position reference sensor.
- FIG 4 is a schematic and block diagram view of one exemplary embodiment of a medical positioning system (MPS) as shown in block form in Figure 1.
- MPS medical positioning system
- Figure 1 is a diagrammatic view of a system 10 in which aspects of the invention may be embodied. It should be understood that while embodiments of the invention will be described in connection with a magnetic field-based positioning system deployed in connection with a fluoroscopy-based imaging system, such an embodiment is exemplary only and not limiting in nature.
- 7,386,339 referred to in the Background discloses motion compensation for patient movements and respiration-induced movements by providing a patient reference sensor (PRS).
- PRS patient reference sensor
- P&O readings that track the motion of a catheter relative to the P&O readings of the PRS
- a certain type of motion compensation can be achieved.
- the movements detected by the PRS shift the coordinate system relative to the coordinate system in which the two dimensional images were acquired.
- the PRS P&O readings may have little or no correlation to the movements of an internal moving organ.
- the system 10 as depicted includes a main control 12 having various input/output mechanisms 14, a main display 16, an image database 18, a localization system such as a medical positioning system (MPS) system 20, an ECG monitor 22, a plurality of MPS position reference sensors designated 241 , 24 2 and 24 3 , and an MPS-enabled medical device 26 (which itself includes a position reference sensor).
- the MPS-enabled device 26 may be any interventional device or delivery tool.
- the device 26 may include guidewires, stylets, cannulation catheters, EP catheters and the like.
- the main control 12 in a computer-implemented embodiment, is programmed to perform a plurality of functions, including those shown in block form in Figure 1 : a motion compensation function 28, a position and orientation (P&O) correction function 30 and an image super-imposing function 32.
- the main control 12 is configured generally to generate data to be displayed (e.g., single image or sequence of images) corresponding to a moving region of interest (ROI) located within the body of a patient.
- the control 12 is specifically configured (by way of function blocks 28, 30 and 32) to accurately
- the input/output mechanisms 14 may comprise conventional apparatus for interfacing with a computer-based control, for example, a keyboard, a mouse, a tablet or the like.
- the display 16 may also comprise conventional apparatus.
- the image database 18 is configured to store image information of relating to the patient's body, including the moving region of interest, and which may comprise (1) one or more two-dimensional still images acquired at respective, individual times in the past; (2) a plurality of related two-dimensional images obtained in real-time from an image acquisition device (e.g., fluoroscopic images from an x-ray imaging apparatus, such as that shown in exemplary fashion in Figure 2) wherein the image database acts as a buffer (live fluoroscopy); and/or (3) a sequence of related two-dimensional images defining a cine- loop (CL) wherein each image in the sequence has at least an ECG timing parameter associated therewith adequate to allow playback of the sequence in accordance with acquired real-time ECG signals obtained from the ECG monitor 22.
- the two-dimensional images may be acquired through any imaging modality, now known or hereafter developed, for example X-ray, ultra-sound,
- the MPS system 20 is configured to acquire positioning (localization) data (i. e., position and orientation— P&O) of one or more MPS sensors.
- the P&O may be expressed as a position (i.e., a coordinate in three axes X, Y and Z) and orientation (i. e., an azimuth and elevation) of the magnetic field sensor in the magnetic field relative to a magnetic field generator(s)/transmitter(s) .
- the internal MPS position reference sensor 241 is associated with a moving region of interest (ROI) in the body, which may be a moving organ, and more specifically may be the heart and/or chambers or portions thereof (e.g., atria).
- ROI moving region of interest
- the internal position reference sensor 241 is associated with the ROI in such a way that it will move together with the moving ROI, and thus fairly indicate the motion of the region of interest.
- associating the sensor 241 with the region of interest may be done in any one or more ways: (1) placing the sensor 241 , or an interventional device like a catheter carrying the sensor 241 , in an anatomical area where it is held by the anatomy itself, for example, a catheter that has been maneuvered in a tubular organ like the coronary sinus; (2) fixing the sensor 241 , or an interventional device like a catheter carrying the sensor, to the anatomy in the region of interest using a fixation mechanism, active or passive, for the duration of the procedure; (3) holding the sensor 24i, or an interventional device like a catheter carrying the sensor, in steady contact with the anatomy in the region of interest; and (4) placing sensor 24i (or interventional device carrying the sensor) in a non-MPS-enabled device that is in turn affixed to the anatomy in the region of interest.
- an example may include placing the sensor 241 epicardially in the surface of the heart.
- an example may include associating the sensor 24) with a catheter that is maneuvered into steady contact with the heart interior.
- an example may include placing an MPS-enabled guidewire (having the sensor 241) in the lumen of a pacing lead that is in turn affixed to the tissue of a heart chamber.
- One or more additional, optional internal position sensors may be provided, for example, as shown by sensor 24 2 .
- the additional one or more sensors 24 2 may be associated with either or both of the (1) the moving region of interest; or (2) the medical device 26.
- the additional sensors 24 2 are configured to provide additional data points (P&O readings) with respect to either the moving region of interest or medical device, as the case may be, thereby providing addition information concerning their respective motions over time.
- the patient reference sensor (PRS) 24 3 is configured to provide a stable, positional reference of the patient's body so as to allow motion compensation for gross patient body movements and/or respiration-induced movements, as described above.
- the PRS 24 3 may be attached to the patient's manubrium sternum, a stable place on the chest, or other location that is relatively positionally stable.
- the P&O may be based on capturing and processing the signals received from the magnetic field sensor while in the presence of a controlled low-strength AC magnetic field.
- the internal sensors may each comprise one or more magnetic field detection coil(s), and it should be understood that variations as to the number of coils, their geometries, spatial relationships, the existence or absence of cores and the like are possible. From an electromagnetic perspective - all sensors are created equal: voltage is induced on a coil residing in a changing magnetic field, as contemplated here.
- the sensors 24 are thus configured to detect one or more characteristics of the magnetic field(s) in which they are disposed and generate an indicative signal, which is further processed to obtain the P&O thereof.
- the electro-cardiogram (ECG) monitor 22 is configured to continuously detect an electrical timing signal of the heart organ through the use of a plurality of ECG electrodes (not shown), which may be externally-affixed to the outside of a patient's body.
- the timing signal generally corresponds to the particular phase of the cardiac cycle, among other things.
- the ECG signal may be used by the main control 12 for ECG synchronized play-back of a previously captured sequences of images (cine loop).
- the ECG monitor 22 and ECG-electrodes may comprise conventional components.
- FIG. 2 is a diagrammatic view of an embodiment which includes a self- contained imaging capability, along with motion compensation. More specifically, the system 10 is shown as being incorporated into an fluoroscopic imaging system 34, which may include commercially available fluoroscopic imaging components (i.e., "Catheter Lab”).
- the MPS system 20 in a magnetic field-based embodiment, includes a magnetic transmitter assembly (MTA) 36 and a magnetic processing core 38 for determining position and orientation (P&O) readings.
- the MTA 36 is configured to generate the magnetic field(s) in and around the patient's chest cavity, in a predefined three- dimensional space designated a motion box 40 in Figure 2.
- the processing core 38 is responsive to these detected signals and is configured to calculate respective three- dimensional position and orientation (P&O) readings for each MPS sensor 24; in the motion box 40.
- P&O three- dimensional position and orientation
- the positional relationship between the image coordinate system and the MPS coordinate system may be calculated based on a known optical-magnetic calibration of the system (e.g., established during setup), since the positioning system and imaging system may be considered fixed relative to each other in such an embodiment.
- a registration step may need to be performed initially.
- An MPS system 20 will be described in greater detail below in connection with Figure 4.
- the main control 12 includes the capability of producing (and superimposing) a projection of the real-time location information (P&O) of a medical device on previously recorded x-ray images or in the case of cine-loops (CL), onto each image in the sequence.
- P&O real-time location information
- the main control 12 can replay a cine loop in an ECG synchronized and respiration-induced motion compensated manner.
- the sequence is replayed in concordance with a real-time ECG signal (cardiac phase) of the patient.
- the main control 12 may also be configured to include a respiration compensation algorithm configured to learn the motion induced by the patient's respiration, based on P&O readings from the PRS. The main control 12 then calculates a respiration con-ection factor to apply to P&O measurements that are to be projected onto a sequence of cine-loop images.
- the PRS position signal allows for motion compensation for any patient's body movements, as the medical device's position (i.e., P&O measurement) may preferably be taken relative to the P&O measurements from the PRS.
- ECG signals and PRS signal Conventional signals
- the ECG signal cannot serve as a predictor or correlation input for the motion of the atria.
- one or more of the internal (i.e., inside the body) position reference sensors are located in the vicinity of the region of interest, or are otherwise associated with the region of interest (e.g., affixed) such that the internal MPS reference sensor moves together with the region of interest over time.
- the MPS system 20 acquire a series of location (i. e. , position and orientation) readings from the sensor.
- the motion compensation function block 28 ( Figure 1) determines the motion of the sensor (e.g., sensor 24 1 ) according to acquired series of P&O readings.
- the block 28 further determines the motion of the region of interest based on the motion of the sensor, which may have a direct correspondence.
- Figures 3A-3C are schematic diagram views of a region of interest, generally referenced 100, at three different activity states (states of movement), designated 100i, 100 2 and IOO 3 .
- an internal MPS position reference sensor 24i is placed in the vicinity of the region of interest 100 (e.g., at the orifice of the superior vena cava).
- the region of interest 100 is depicted as a circle for simplicity.
- the region of interest l OOi is at a first activity state.
- the MPS system 20 detects a first position of the sensor 24 1 at the first activity state.
- This first position (P&O) is represented as a vector 104i relative to an arbitrary origin 102.
- the arbitrary origin 102 may be, for example, the location of the MTA 36 in the MPS system 102, a location on the motion box 40 or any other known location.
- the region of interest 100 2 is at a second activity state, which as shown is contracted relative to the first activity state.
- the MPS system 20 detects a second position (i.e. , position and orientation) 104 2 of the sensor 24) . Note that the sensor 24) moves with the region of interest as it moves.
- the region of interest 100 3 is at a third activity state, which as shown is expanded relative to the first activity state.
- the MPS system 20 detects a third position (P&O) 104 3 of the sensor 24, .
- the series of detected first, second and third positions 104 l s 104 2 and 104 3 of the sensor 24 ⁇ acquired by the MPS system 20 over time defines not only the motion of the sensor itself but also defines the motion of the region of interest.
- compensation function block 28 may determine the motion of the region of interest 100 directly in accordance with the motion of the sensor 24 1 . This same motion can be assumed to influence the motion of the medical device 26, provided predefined criteria are met.
- the criteria include verifying that an adequate level of correlation exists between the motion of the medical device 26 and the motion of the region of interest 100.
- One approach to verifying correlation is to compare the respective motions relative to a common time-line. For example, over some time interval, the system 10 may track the motion of the device 26, as indicated by the detected P&O's 106 1? 106 2 and I O63 shown in Figures 3A-3C, in addition to tracking the motion of the internal position sensor 241. The system 10 compares the two motions and when the level of correlation exceeds a predetermined threshold, the correlation level is deemed adequate (predetermined criteria satisfied).
- correlation approaches may be determined empirically (e.g., bench testing). It should be further understood that the effect of the correlation threshold on the received error will also depend on the types of motions involved. Accordingly, motion compensation/correction will be performed.
- the system 10 may additionally verify that a minimum level of correlation exists between the motion of the device 26 and the other compensation signals described above (i.e., the ECG signal(s) as well as the PRS signal). If there is only poor correlation between the motion of the device 26 and these compensation signals then compensation will not be performed at all. When motion correlation has been verified, the assumption that the motion of the region of interest will influence the motion of the device 26 can be relied on. After correlation has been verified, the MPS system 20 is then enabled to provide motion compensation.
- the other compensation signals described above i.e., the ECG signal(s) as well as the PRS signal.
- the MPS system 20 will generate data adequate to track the motion of a moving region of interest over time (e.g., via the internal sensor 24]) and allow the compensation function block 28 to generate a time varying motion compensation function.
- the motion of the internal sensor e.g., sensor 241
- the motion of the internal sensor provides data adequate to implement a similar
- the compensation function produced based on the motion of the sensor 241 is a time-varying spatial function which accounts for the motion of the region of interest between a first time (at which the image was acquired) and a second time (at which the P&O of the device was measured). Assume that a two-dimensional image was acquired at a time when the region interest was in the first activity state lOOi (i.e., Figure 3A). In this instance, a measured P&O of the device 26 would not need any motion compensation, at least not any to compensate for the motion of the region of interest.
- the compensation function evaluated at the time of the second activity state is a displacement vector that compensates for the motion of the region of interest between the given time (i. e. , time of the measured device P&O— the time of the second activity state) and the time of the image (i.e., the time the image was acquired— the time of the first activity state).
- the compensation function evaluated at the time of the third activity state 100 3 is a displacement vector to compensate for motion between the given time (i.e., the time of the measured device P&O- -the time of the third activity state) and the time of the image (i.e., the time the image was acquired— the time of the first activity state).
- the compensation function will constitute a vector displacement (and potentially rotation) by which the measured P&O of the MPS-enabled device 26 has to be corrected to match a given time in the past (i.e. , at which the image was acquired).
- the displacement vector may be weighted in accordance with a weighting factor, which in turn may be calculated based on the calculated con-elation level described above.
- Motion compensation approaches may be used as disclosed in U.S. 7,386,339 referred to above as well U.S. 7,343,195 (Application No. 09/949,160 filed September 7, 2001) entitled "METHOD AND APPARATUS FOR REAL TIME QUANTITATIVE THREE-DIMENSIONAL IMAGE RECONSTRUCTION OF A MOVING ORGAN AND INTRA-BODY
- the P&O correction block 30 is configured to correct the P&O reading obtained at the given time using the compensation function.
- P&O correction function 30 adjusts the measured P&O of the medical device in accordance with the calculated displacement vector (and potentially rotation) described above.
- Projection Finally, a projection of the corrected P&O (three-dimensional) is made onto the two-dimensional image, with a representation of the medical device being superimposed on the image (e.g., may be cross-hairs representing the tip of a catheter or other representation). The resulting image may then be displayed on the display 16.
- the coordinates of any 3D object e.g., sensor, landmark or other artifacts
- a coordinate transformation matrix that computes the corresponding 2D coordinates on the displayed image.
- the compensation function block 28 implements a composite motion compensation function that is formed by the summation of individual motion compensation contributions, i.e., the individual displacement vectors and (potentially rotations) attributable to each
- additional sensors may be located on the medical device 26 or other medical devices and/or tools, for example, another MPS sensor disposed on a catheter, guide- wire, etc.
- the P&O readings from additional internal sensors may reveal other movements or other aspects to the movements of the region of interest and/or the medical device.
- the composite compensation function may include a number of terms where each term corresponds to an input, i.e., one term being provided with respect to the PRS, another term being provided with respect to the internal sensor 241, still another term being provided with respect to an additional sensor 24 2 , and so on.
- the inputs from the PRS, the ECG signals and the one or more internal MPS reference sensors may be used in combination to provide for robust motion compensation.
- the individual inputs are weighted by a respective weighting factor to form a composite motion compensation function.
- the respective level of con-elation is a principal factor according to which each weighting factor is determined.
- the weighted function can be depicted as weighted vector summation of the compensation function vectors.
- FIG. 4 is a schematic and block diagram of one exemplary embodiment of MPS system 20, designated as an MPS system 108, as also seen by reference to U.S. Patent No. 7,386,339, refeired to above, and portions of which are reproduced below. It should be understood that variations are possible, for example, as also seen by reference to U.S. Patent No. 6,233,476 entitled MEDICAL POSITIONING SYSTEM, also hereby incorporated by reference in its entirety. This description is exemplary only and not limiting in nature.
- MPS system 1 10 includes a location and orientation processor 150, a transmitter interface 152, a plurality of look-up table units 154 l s 154 2 and 154 3 , a plurality of digital to analog converters (DAC) 156 1 ⁇ 156 2 and 156 3 , an amplifier 158, a transmitter 160, a plurality of MPS sensors 162 l s 162 2 , 162 3 and 162 N , a plurality of analog to digital converters (ADC) 164 l s 164 2 , 164 3 and 164 N and a sensor interface 166.
- ADC analog to digital converters
- Transmitter interface 152 is connected to location and orientation processor 150 and to look-up table units 154 l s 154 2 and 154 3 .
- DAC units 156i , 156 2 and 156 3 are connected to a respective one of look-up table units 154j, 154 2 and 154 3 and to amplifier 158.
- Amplifier 158 is further connected to transmitter 160.
- Transmitter 160 is also marked TX.
- MPS sensors 162 u 162 2 , 162 3 and 162 N are further marked RX h RX 2 , RX 3 and RXN, respectively.
- Analog to digital converters (ADC) 164 l s 164 2 , 164 and 164 N are respectively connected to sensors 162 1 ? 162 2 , 162 3 and 162N and to sensor interface 166.
- Sensor interface 166 is further connected to location and orientation processor 150.
- Each of look-up table units 154j, 154 2 and 154 3 produces a cyclic sequence of numbers and provides it to the respective DAC unit 156i, 156 2 and 156 3 , which in turn translates it to a respective analog signal.
- Each of the analog signals is respective of a different spatial axis.
- look-up table 154i and DAC unit 156i produce a signal for the X axis
- look-up table 154 2 and DAC unit 156 2 produce a signal for the Y axis
- look-up table 154 3 and DAC unit 156 3 produce a signal for the Z axis.
- DAC units 156 l 5 156 2 and 156 3 provide their respective analog signals to amplifier 158, which amplifies and provides the amplified signals to transmitter 160.
- Transmitter 160 provides a multiple axis electromagnetic field, which can be detected by MPS sensors I 62 u 162 2 , 162 3 and 162 N .
- MPS sensors 162 b 162 2 , 162 3 and 162 N detects an electromagnetic field, produces a respective electrical analog signal and provides it to the respective ADC unit 164 ls 164 2 , 164 3 and 164 N connected thereto.
- Each of the ADC units 164i, 164 2 , 164 3 and 164N digitizes the analog signal fed thereto, converts it to a sequence of numbers and provides it to sensor interface 166, which in turn provides it to location and orientation processor 150.
- Location and orientation processor 150 analyzes the received sequences of numbers, thereby determining the location and orientation of each of the MPS sensors 162], 162 2 , 162 3 and 162 N .
- Location and orientation processor 150 further determines distortion events and updates look-up tables 154i, 1542 and 154 3 , accordingly.
- High-fidelity device positioning as provided through the motion compensation embodiments described herein may be used for alternate purposes such as for placing accurate landmarks (i.e., to serve as navigation references of other devices), for co-registration with other modalities (e.g., Ensite NavX, computed tomography (CT)), as well as for determining when or distinguishing between a "real" motion (i. e., like the actual moving of a catheter by the physician) has occurred versus what seems to be motion but is actually an external event, such as patient motion.
- modalities e.g., Ensite NavX, computed tomography (CT)
- system 10 may include conventional processing apparatus known in the art, capable of executing pre-programmed instructions stored in an associated memory, all performing in accordance with the functionality described herein. It is contemplated that the methods described herein, including without limitation the method steps of embodiments of the invention, will be programmed in a preferred embodiment, with the resulting software being stored in an associated memory and where so described, may also constitute the means for performing such methods. Implementation of the invention, in software, in view of the foregoing enabling description, would require no more than routine application of programming skills by one of ordinary skill in the art. Such a system may further be of the type having both ROM, RAM, a combination of non-volatile and volatile (modifiable) memory so that the software can be stored and yet allow storage and processing of dynamically produced data and/or signals.
- joinder references do not necessarily infer that two elements are directly connected and in fixed relation to each other. It is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative only and not limiting. Changes in detail or structure may be made without departing from the spirit of the invention as defined in the appended claims.
Priority Applications (3)
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EP19162165.5A EP3513721B1 (de) | 2009-12-31 | 2010-09-24 | Bewegungskompensation in einem bewegten organ mithilfe eines internen positionsreferenzsensors |
JP2012547067A JP5675841B2 (ja) | 2009-12-31 | 2010-09-24 | 位置参照センサを使用した、動く器官における動きの補償 |
EP10841418.6A EP2470072B1 (de) | 2009-12-31 | 2010-09-24 | Bewegungskompensation in einem bewegten organ mithilfe eines internen positionsreferenzsensors |
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US12/650,932 | 2009-12-31 | ||
US12/650,932 US10069668B2 (en) | 2009-12-31 | 2009-12-31 | Compensation of motion in a moving organ using an internal position reference sensor |
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US11949545B2 (en) | 2024-04-02 |
US10917281B2 (en) | 2021-02-09 |
EP3513721B1 (de) | 2022-09-07 |
US20190044784A1 (en) | 2019-02-07 |
EP2470072A1 (de) | 2012-07-04 |
JP2013516219A (ja) | 2013-05-13 |
US20110158488A1 (en) | 2011-06-30 |
EP2470072A4 (de) | 2015-03-25 |
JP5675841B2 (ja) | 2015-02-25 |
EP3513721A2 (de) | 2019-07-24 |
US20210168013A1 (en) | 2021-06-03 |
US10069668B2 (en) | 2018-09-04 |
EP3513721A3 (de) | 2019-10-23 |
EP2470072B1 (de) | 2019-04-24 |
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